Case study: Measurement uncertainties and e-mark for filling system

How can I efficiently adjust my filling system for the composition of meals in a box? This was the problem facing one packager. The packaged meals included several meal components, such as sauce, rice, herbs and marinade. All the components were listed on the box and the total then had to meet the e-mark requirements. NMi was asked to develop a calculation model for the filling system.

Filling system

Some of the meal components were purchased, while others were filled by the company from stock. The company also filled specific orders. The following data were available for all the existing components: the average quantity of product, the standard deviation and the (measured or calculated) percentage of pre-packaging with a quantity of product below the TU1 limit of each component.

In order to guarantee that the quantity of product in the meals met the requirements, NMi developed a model which analysed possible combinations of standard meal components and calculated the target weight of components still to be added. The minimum quantity of product in individual pre-packaging (TU1 and TU2 limits) for the different components and the measurement uncertainty of the system were also taken into account.